Ultra-Pure Type S Thermocouple Wire PtRh10-Pt 0.3mm For Industrial Furnaces

High-purity Type S (PtRh10-Pt) thermocouple wire with a precision 0.3mm diameter, designed for continuous temperature measurement in oxidizing and inert atmospheres up to 1600°C (short-term up to 1700°C). Manufactured through vacuum induction melting and micro-die precision drawing to ensure ultra-low thermoelectric drift, uniform grain structure, and long operational lifespan in industrial heating and thermal processing systems.

Thermocouple systems operating in ultra-high-temperature domains demand noble metal conductors capable of maintaining microvolt-level signal integrity under severe thermal stress. Our Type S thermocouple wire pairs high-purity Platinum (negative leg) with a 90% Platinum / 10% Rhodium alloy (positive leg), manufactured under rigorous metallurgical controls to provide superior accuracy and mechanical durability across thermal cycling.

With a nominal 0.3mm wire diameter, this product strikes an optimal balance between fast thermal response and extended service life in high-temperature environments. Each batch undergoes multi-stage continuous annealing in controlled atmospheres to eliminate internal stress, ensure uniform crystal orientation, and prevent premature embrittlement caused by grain boundary oxidation.

Utilizing 99.99% high-purity master ingots and ultra-clean vacuum melting, the 0.3mm Type S thermocouple wire prevents trace metallic contamination, ensuring consistent EMF output and minimal calibration shift across thousands of operational hours.

The inherent noble metal chemistry of Platinum and Rhodium provides exceptional chemical inertness. It resists rapid surface oxidation, scaling, and vapor degradation in oxidizing and inert furnace environments at temperatures exceeding 1500°C.

Drawn through specialized diamond dies, the wire achieves tight dimensional tolerances (±0.003 mm) with a smooth, defect-free surface finish that reduces hot spots and facilitates trouble-free ceramic insulator assembly.

Controlled thermal annealing yields fine, uniform grain morphology, providing excellent bendability for complex probe assemblies while resisting grain coarsening and thermal sagging at elevated operating temperatures.

• Industrial Kilns and Sintering Furnaces: Critical temperature regulation in advanced ceramics, structural refractory firing, and powder metallurgy sintering processes.
• Glass Manufacturing and Melting Tanks: High-accuracy thermal profiling in glass forehearths, feeder bowls, and continuous melting chambers requiring resistance to volatilization.
• Semiconductor and Photovoltaic Processing: Precise thermal profiling in wafer diffusion furnaces, MOCVD reactors, and crystal growing apparatus where zero base-metal contamination is mandated.
• Laboratory Metrology and Primary Calibration: Used as secondary and working reference standards for calibrating base-metal thermocouples, optical pyrometers, and thermal analyzers.
• Aerospace and Metallurgical Heat Treatment: Reliable process tracking in vacuum brazing, hot isostatic pressing (HIP), and superalloy thermal cycle validation.

DLX specializes in the development and precision processing of high-performance noble metal and specialty alloy materials. Equipped with vacuum induction melting facilities, precision drawing lines, and comprehensive thermal-EMF testing laboratories, we ensure that every batch of Type S thermocouple wire meets strict quality standards.

• Traceable Purity Control: Complete spectroscopic verification of raw materials ensures raw platinum purity of 99.99% and exact 10% rhodium balance without harmful trace elements.
• Full-Range Thermal EMF Testing: Every coil undergoes multi-point calibration verification against certified reference standards to guarantee temperature-to-voltage linearity.
• Customized Engineering Support: Available in matched thermocouple pairs, pre-cut lengths, duplex configurations, or customized spooling dimensions according to specific OEM and sensor manufacturing requirements.
• Export-Grade Protection Packaging: Delivered on high-strength precision spools sealed in moisture-proof, shock-absorbing cleanroom packaging to prevent mechanical deformation during transit.

Type S wire performs best in oxidizing, inert, and high-vacuum atmospheres. It should not be exposed to reducing atmospheres (such as hydrogen or carbon monoxide) or metallic vapors (such as zinc, arsenic, or sulfur) without impervious ceramic protection tubes (e.g., high-purity recrystallized alumina), as these elements cause platinum embrittlement.

A 0.3mm diameter delivers an ideal compromise for high-temperature furnace sensors: it provides sufficient mechanical strength and longevity against thermal sublimation compared to fine 0.2mm/0.25mm wires, while significantly reducing noble metal material cost compared to 0.4mm or 0.5mm wires.

High-purity (minimum 99.5% Al₂O₃) recrystallized alumina dual-bore or four-bore insulators must be used. Lower-grade ceramic insulators containing silica or iron oxides will contaminate the platinum wire at temperatures above 1100°C and cause severe signal drift.

Yes. We supply individual positive/negative spools as well as precision-matched pairs calibrated to guarantee exact Class 1 or Standard tolerance thermal EMF output across the intended temperature curve.